diff --git a/Dockerfile-kaf b/Dockerfile-kaf
index 7c25d95..d1c2cfb 100644
--- a/Dockerfile-kaf
+++ b/Dockerfile-kaf
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 RUN apt update
 RUN apt install openjdk-8-jdk net-tools vim wget -y
 WORKDIR /opt